保留占位符后键入
问题描述:
我有2个输入字段与浮动占位符。焦点上,占位符向上移动并为用户输入空间。但是一旦用户开始输入它就会消失。在文本框中输入内容后,我希望占位符保留在同一个地方。这是可能的只使用CSS?保留占位符后键入
input {
width: 100%;
display: block;
border: none;
padding: 20px 0 10px 0;
border-bottom: solid 1px #343a40;
-webkit-transition: all 0.3s cubic-bezier(0.64, 0.09, 0.08, 1);
transition: all 0.3s cubic-bezier(0.64, 0.09, 0.08, 1);
background: -webkit-linear-gradient(top, rgba(255, 255, 255, 0) 99%, #007bff 1%);
background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 99%, #007bff 1%);
background-position: -1000px 0;
background-size: auto 100%;
background-repeat: no-repeat;
color: #000;
}
input:focus,
input:valid {
box-shadow: none;
outline: none;
background-position: 0 0;
}
input::-webkit-input-placeholder {
font-family: 'roboto', sans-serif;
-webkit-transition: all 0.3s ease-in-out;
transition: all 0.3s ease-in-out;
}
input:focus::-webkit-input-placeholder,
input:valid::-webkit-input-placeholder {
color: #007bff;
font-size: 12px;
-webkit-transform: translateY(-20px);
transform: translateY(-20px);
visibility: visible !important;
}
<input placeholder="Username" type="text" required>
<input placeholder="Password" type="password" required>
答
的评论,你应该使用一个label
。 也正确连接到其输入连贯。
https://www.w3.org/wiki/HTML/Elements/label
<label>
的元素表示在用户界面中的字幕。
- 为HTML属性=串
指定以指示形式控制与该字幕将被相关联。 属性的值必须是与label元素相同的Document中的可链接表单关联元素的ID。
实施例:
<input type="checkbox" id="lost" name="lost"> <label for="lost">Lost</label>
从那里,设置label
输入之后,将经由选择器+
风格化。
CSS例如
label {
position: absolute;
margin-top: -1.75em;/*climbs under the input */
transition: all 0.3s ease-in-out;
}
input {
position: relative;
z-index: 1;/* set input on top of label. opaque white bg color can be used to lighten label's color */
width: 100%;
display: block;
border: none;
padding: 20px 0 10px 0;
border-bottom: solid 1px #343a40;
transition: all 0.3s cubic-bezier(0.64, 0.09, 0.08, 1);
transition: all 0.3s cubic-bezier(0.64, 0.09, 0.08, 1);
background: linear-gradient(
to top,
rgba(255, 255, 255, 0) 99%,
#007bff 1%
);
background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 99%, #007bff 1%)
rgba(255, 255, 255, 0.4);
background-position: -1000px 0;
background-size: auto 100%;
background-repeat: no-repeat;
color: transparent;/* hide value if any when label is standing here too */
}
input:focus {
color: #000;
}
input:valid + label {
color: #06a31b;
z-index: 1;/* let's show this field is filled */
}
input:focus + label, input:active + label {
font-size: 12px;
color: #007bff;
font-size: 12px;
transform: translateY(-2em);/* move it up more */
}
input:focus,
input:valid {
box-shadow: none;
outline: none;
background-position: 0 0;
}
<input placeholder="" id="User" type="text" required><label for="User">Username</label>
<input id="pwd" placeholder="" type="password" required><label for="pwd">Password</label>
其它CSS例子标签代表在顶部一次现场充满
label {
position: absolute;
margin-top: -1.75em;/*climbs under the input */
transition: all 0.3s ease-in-out;
}
input {
position: relative;
z-index: 1;/* set input on top of label. opaque white bg color can be used to lighten label's color */
width: 100%;
display: block;
border: none;
padding: 20px 0 10px 0;
border-bottom: solid 1px #343a40;
transition: all 0.3s cubic-bezier(0.64, 0.09, 0.08, 1);
transition: all 0.3s cubic-bezier(0.64, 0.09, 0.08, 1);
background:linear-gradient(
to top,
rgba(255, 255, 255, 0) 99%,
#007bff 1%
);
background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 99%, #007bff 1%)
rgba(255, 255, 255, 0.4);
background-position: -1000px 0;
background-size: auto 100%;
background-repeat: no-repeat;
}
input:focus {
color: #000;
}
input:valid + label,
input:focus + label, input:active + label {
font-size: 12px;
color: #007bff;
font-size: 12px;
transform: translateY(-2em);/* move it up more */
}
input:focus,
input:valid {
box-shadow: none;
outline: none;
background-position: 0 0;
}
<input placeholder="" id="User" type="text" required><label for="User">Username</label>
<input id="pwd" placeholder="" type="password" required><label for="pwd">Password</label>
对于相关信息::valid/:invalid
是CSS选择器水平4仍处于状态https://drafts.csswg.org/selectors-4/#validity-pseudos草案,但尚未很好inplemented http://caniuse.com/#search=%3Avalid
使用标签,而不是一个占位符和风格标签 –
不是真的,因为一旦输入有任何内容,占位符不显示了。如果您使用标签而不是占位符,则可以实现此目的 - [占位符无论如何都被认为是有害的](https://www.nngroup.com/articles/form-design-placeholders/)。但是,公平地说 - 浮动标签模式也是如此(https://medium.com/simple-human/floating-labels-are-a-bad-idea-82edb64220f6)。所以,如果可用性是你关注的焦点,而不仅仅是设计师的虚荣心......那么你也许不应该使用其中的任何一个。 – CBroe
这真的有道理..谢谢@CBroe – Venky